AZ-204 Quiz

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App Configuration (1 / 13):

In Azure App Configuration, when loading configuration and using multiple .Select() calls, how does the order of these calls affect the values that are used if a key with the same name exists in both labels? Consider the following code snippet used to load configuration from Azure App Configuration:

builder.Configuration.AddAzureAppConfiguration(options =>
{
    options.Connect(connectionString)
           // Select a subset of the configuration keys
           .Select("TestApp:*", LabelFilter.Null)
           .Select("TestApp:*", "dev");
});

Only the last .Select() is considered. Values with keys starting with "TestApp:" and the label "dev" will be used; all values with no label will be discarded.
Only the first .Select() is considered. Values with keys starting with "TestApp:" and the label "dev" will not be loaded.
Both labeled and unlabeled values will be merged; if the same key exists in both, only the value from the first .Select() (no label) will be considered, and "dev" will not override them.
Both labeled and unlabeled values will be merged; if the same key exists in both, values from the last Select() ("dev" label) will override the existing (no label).
- An exception will be thrown

Answer:

Merge and override previous values

Exam revision: April 11, 2025